A method for simultaneous measurement of stress and displacement in saturated granular media based on transparent photoelastic materials

Abstract

The invention belongs to the technical field of experiment mechanical tests and provides a method for simultaneously measuring saturated particle medium stress and displacement based on a transparentphotoelastic material. An experiment stress photoelastic method is experimented and characteristicscharacterized in that a transparent particle medium generates optical anisotropy when being deformedby a force; a polarized light penetration penetrates through a model is used for generating a temporary birefringent phenomenon of light in the presence of stress; then the interference of the light is generated after the light penetrates through an analysis mirror and a phenomenon of bright and dark fringes is displayed on a screen; stress states and distribution in the model can be obtained by utilizing images of the fringes with the same color. According to the method provided by the invention, the transparent photoelastic material and pore liquid matched with a matched refraction coefficient are prepared into a saturated porous particle medium material; the method can be used for researching a deformation mechanism and a stress distribution rule in the natural saturated porous particlemedium materials including geotechnical materials and the like under the action of an external force; the research cost is reduced and an inner mechanism of mechanical behaviors of particle materialsis comprehended.

Description

technical field [0001] The invention belongs to the technical field of experimental mechanics testing, and relates to a method for measuring the stress and displacement of saturated granular media, in particular to measuring the internal stress and displacement of particles using transparent photoelastic granular media and pore liquids with matching refractive indices and digital image correlation techniques. A method by which particles are displaced. Background technique [0002] Granular materials are ubiquitous in nature and industry, such as sand and gravel materials, glass beads, grains, and industrial medicines. The stress and deformation under the action of external load or self-weight is an important issue that both researchers and industrialists pay more attention to. Due to the complex stress and displacement of granular materials under the action of external force, and the large number of particles, it is a relatively difficult problem to measure the stress and d...

AI Technical Summary

Problems solved by technology

Due to the complex stress and displacement of granular materials under the action of external force, and the large number of particles, it is a relatively difficult problem to measure the stress and displacement inside granular materials. At present, the measurement of deformation can already use X-ray tomography and CT scanning technology is realized, but because these technologies are relatively expensive, it is difficult to be widely used

In addition, there is no better method for measuring the internal stress of granular material aggregates.

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